Space disk in F5-BIG-LTM-VE

While the GUI may show that you have available disk space overall (e.g. screenshot below), you really need to check it at a directory level via the CLI.

In CLI I have no access error 'connection refused".

Due to you not being able to SSH to the device, I would hazard a guess that your "/" (root) folder is full. From experience this usually happens when an administrator transfers a BIG-IP software ISO image to this "/" folder (which has a small amount of space allocated to it) instead of /shared/images. You need to log on via virtual console as boneyard said and check file system disk space and see if there are any folders that are 100% full.

Example (using df -h) command to check disk space

[root@BIGIP-1:Active:In Sync] config # df -h
Filesystem                             Size  Used Avail Use% Mounted on
/dev/mapper/vg--db--vda-set.2.root     419M   76M  317M  20% /
devtmpfs                               5.9G  4.0K  5.9G   1% /dev
tmpfs                                  5.9G  440M  5.5G   8% /dev/shm
tmpfs                                  5.9G  2.3M  5.9G   1% /run
tmpfs                                  5.9G     0  5.9G   0% /sys/fs/cgroup
/dev/mapper/vg--db--vda-set.2._usr     5.9G  5.2G  421M  93% /usr
/dev/mapper/vg--db--vda-dat.appdata     25G  1.7G   22G   8% /appdata
/dev/mapper/vg--db--vda-dat.share       15G  3.3G   11G  24% /shared
none                                   5.9G   32M  5.9G   1% /shared/rrd.1.2
/dev/mapper/vg--db--vda-set.2._config  2.1G  521M  1.5G  27% /config
/dev/mapper/vg--db--vda-set.2._var     4.4G  1.1G  3.0G  27% /var
prompt                                 4.0M   28K  4.0M   1% /var/prompt
none                                   5.9G   33M  5.9G   1% /var/tmstat
/dev/mapper/vg--db--vda-dat.log        2.9G  341M  2.4G  13% /var/log
none                                   5.9G  4.0K  5.9G   1% /run/pamcache
none                                   5.9G     0  5.9G   0% /var/loipc
/dev/loop0                             445M  445M     0 100% /var/apm/mount/apmclients-7250.2024.1010.1953-6802.0.iso
none                                   5.9G     0  5.9G   0% /mnt/sshplugin_tempfs